Typical self-discharge of high quality deep cycle flooded batteries at different temperatures

A fully charged batteries shelf life may discharge at approximately:

6% per month when stored at 8°C/46°F

9% per month when stored at 20°C/68°F

15% per month when stored at 30°C/86°F

30% per month when stored at 40°C/104°F

Batteries kept in storage while discharged will not perform as intended when put into service. Battery inventories should be constantly checked and re-charged when necessary. A battery in storage should never be allowed to discharge more than 45-50% of its original capacity.